Vibrating screen device



26, 1958 J. R. GUESS 2,849,119 VIBRATION SCREEN DEVICE Filed Aug. 2,1954 f 2 Sheets-Sheet 1 INVENT01;.

a/05EPH R 64/555 ATTORNEY Q R N Aug. 26, 1958 2 Sheets-Sheet 2 FiledAug. 2, 1954 INVENTOR. GUESS C/OSEPH A.

A rro/PNE Y United States Patent VIBRATING SCREEN DEVICE Joseph R.Guess, Covina, Calif.

Application August 2, 1954, Serial No. 447,064

6 Claims. (Cl. 209-365) This invention relates to a screen device forsorting materials and deals more particularly with a vibrating screenfor sorting one size of material from the remainder thereof.

In the sorting or sifting of rock, stone, gravel, sand, etc., in which ascreen is used, said screen is usually disposed on a slope or angle thatvaries according to the material being handled and the same is vibrated,jarred or agitated to jounce the material progressively along the slopeof the screen, while material particles fall through the interstices ofthe screen. In the main, such conventional sloping screens can be variedin their action only by changing the slope of the screen, by adjustingthe vibration-inducing means, or by changing the screen cloth to changethe mesh size thereof. In any case, the speed or rate of feed ofmaterial from one end of the screen to the other is, primarily, afunction of the screen slope, the force of vibration being maintainedconstant. Even if vibration is increased, the slope of the screen isnecessary to create a progression or movement of the material from thehigher end to the lower end.

An object of this invention is to provide a materialseparating screenthat is maintained level or substantially so, at all times, and in whichthe separating screen is moved in a vibratory path such as toprogressively move the material from one end of the screen to the other.

Another object of the invention is to provide a screen of the characterindicated in which the material is jounced or tossed in an angulardirection that is the component of an up-and-down force and a forwardlyapplied force. Thus, although the screen is level, the material bouncesupwardly and forwardly toward the discharge end of the screen.

A further object of the invention is to provide means to vary the angleof the mentioned component of vibrating forces to, thereby, vary therate of movement of the material from the inlet to the discharge end ofthe screen.

A still further object of the invention is to provide amaterial-separating screen that can be adjusted as easily to movematerial in one direction as in the other.

The invention also has for its objects to provide such means that arepositive in operation, convenient in use, easily installed in a workingposition and easily disconnected therefrom, economical of manufacture,relatively simple, and of general superiority and serviceability.

The invention also comprises novel details of construction and novelcombinations and arrangements of parts, which will more fully appear inthe course of the following description. However, the drawings merelyshow and the following description merely describes, one embodiment ofthe present invention, which is given by way of illustration or exampleonly.

In the drawings, like reference characters designate.

similar parts in the several views.

Fig. 1 is a top plan view of a screen according to the presentinvention, a portion of the driving means being broken away.

Fig. 2 is a side elevational view thereof.

Fig. 3 is an enlarged vertical sectional view as taken on line 3-3 ofFig. 2.

Fig. 4 is a further enlarged fragmentary sectional view as takensubstantially on the plane of line 4-4 of Fig. 1.

Fig. 5 is a cross-sectional view as taken on line 5-5 of Fig. 4.

The vibrating screen device that is illustrated comprises, generally, abase 10, a screen unit 11 mounted on said base, means 12 (Fig. 5) toadjust the angle of movement of the screen unit, means 13 to operatesaid screen unit, and means 14 to drive the operating means 13.

The base 10 simply comprises an enclosure or frame 15 that defines thespace in which the screened materials are received and from which thesame pass either to another screen device or to storage, as the case maybe. In the present instance, said base, on each side thereof, isprovided with longitudinally spaced bearing standards 16, the same beingdisposed as transverse pairs, as shown in Fig. 1. A transverse tube 17extends between the standards of each pair and the same, because of itsimmovability, may be considered as part of the base.

The screen unit 11 comprises sides 18 that are connected at the loweredges as by transverse members 19 and above which a screen cloth 20 isplaced, as can be seen from Fig. 3. The unit 11 further includes hubs 21that are each provided with a flange 22 and with a hearing 23constituting an extension of said hub and flange. The hubs 21 encircletubes 17 inward of and adjacent to bearing standards 16. Said hubs havecircular concentric-extensions 24 that fit suitable circular openings insides 18. Thus, as seen best in Fig. 4, said hubs may be angularlyadjusted around the respective axes of tubes 17.

The bearings 23, on opposite sides, are connected by a tube or rod 25that, therefore, is offset from and parallel to its respective tube 17.Said rod 25 insures that the angular adjustment of bearings 23 onopposite sides is the same. The rods 25 constitute parts of the means 12and the adjustment is shown, in this case, as being locked by a bolt 26extending through each flange 22 and through adjacent side 18. A seriesof selective holes 27 in each flange 22 is provided, as shown in Fig. 5,

to enable adjustment, as above. In Fig. 5, an angle of 30 to thevertical is shown and it will be clear that this angle can be increased,decreased to zero, and, if desired, provided in the opposite directionwith respect to the zero position. The above simple adjusting means areintended as exemplary of any suitable adjusting means that may beemployed to change the angular degree and disposition of line 28.

The means 13 to operate the screen unit 11 is shown as comprising ashaft 29 extending axially through each tube 17, the ends of each saidshaft being carried by anti-friction bearings 30 in the respectivebearing standards 16. A preferably circular eccentric 31 is carried byeach end of each shaft 29 beyond bearing standards 16. The inner race 32of an anti-friction bearing 33 is fitted over each said eccentric.

Each end of rod 25 extends through a bearing 34 that is offset from astrap portion 35 in which each of said bearings 33 is fitted. It will beclear that rotation of shafts 29 and of cams or eccentrics 31 thereonimparts, through strap 35, reciprocative movement to rods 25.Accordingly, the screen unit 11 is reciprocated bodily along the line 28(Fig. 5). If the angle of line 28 is changed by use of adjusting means12, the reciprocative direction of movement of the screen unit 11 willchange accordingly.

An important component of the operating means 13 is a compressiblesleeve 36 positioned within each hub 21 and surrounding the end of eachtube 17 that is in register with each respective hub. Said sleeves 36are made with an external diameter to fit within hubs 21 and an internaldiameter to fit around tubes 17. For easier application of said sleeve,the same may be provided with metallic outer and inner tubes to whichthe compressible material is bonded. In this case, one of the syntheticrubbers, such as thiokol or neoprene, may be advantageously used as thecompressible core of sleeve 36.

It will be realized that shafts 25 move in substantially straight linesand the straps 35 have the same reciprocative movement while, at thesame time, moving in a gyratoiy path around circles having the amount ofeccentricity as radii. Consequently, the sleeves 36 are alternatelycompressed on opposite sides as the eccentrics move past high and lowdead centers. The resultant movement of the screen unit is along line 28and within the limits of eccentricity of eccentrics 31.

As above indicated, the movement of the shafts 25 is substantiallystraight. Actually, because the members 36 are compressible, said shafts25 tend to waver slightly with respect to the line 28, on both sides ofsaid line. As a consequence, the actual movement of the screen, ratherthan being perfectly straight, is somewhat elliptical. However, theminor axis of such an ellipse is so small relative to its major axis, asdetermined by the degree of eccentricity of the eccentrics 31, that thescreen movement is substantially or largely along the line 28. Thus, theline 28 represents a path of movement of the screen rather thanindicating a movement along, a straight line. Regardless whether themovement is straight or varying from the straight, the practical resultis that the screen moves in a material-feeding manner as indicated.

The drive means 14 is here shown as a pulley 37 on one end of each shaft29, a motor 38 mounting pulleys 39 in respective alignment with pulleys37, and belts 40 interconnecting the respectively aligned pulleys. Whilenot so shown, said pulleys and belts may be of the type that depend onpositive drive by cleats in the latter in keying engagement in seats inthe former. In this conventional manner, slippage between pulleys andbelts is obviated and positive drive effected that uses the power ofmotor 38 to effect compression of sleeves 36.

Material to be screened is dumped on the end of screen 20 that isopposite to the direction of slope of line 28, in this case, on theright end. Now, as the screen reciprocates, the material is propelledtoward the left end of the screen at a speed comparable to the angle ofslope of said line. The greater the angle relative to the vertical, themore rapid the transition of material beyond the left end of the screen.Of course, in the process of such movement, material is screened,passing through the interstices of screen 20.

While the foregoing has illustrated and described what is nowcontemplated to be the best mode of carrying out the invention, theconstruction is, of course, subject to modification without departingfrom the spirit and scope of the invention. It is, therefore, notdesired to restrict 4 around each eccentric cam and an extension on eachstrap, a rod parallel to each shaft inter-connecting said strapextensions, a hub adjacent each end of each fixed tube, a compressiblemember between each hub and the fixed tube, an extension from each hubconnected to the mentioned rod, a screen disposed above the base, andmeans adjustably connecting said hubs to said screen.

2. A material-screening device comprising a generally rectangular baseat least two pairs of posts extending upwardly from said base, saidposts being provided with at least two pairs of bearings, a driven shaftextending between each pair of bearings and carrying an eccentric cam oneach end thereof, a fixed tube mounted between each pair of posts andaround each shaft, a strap around each eccentric cam and an extension oneach strap, a rod parallel to each shaft inter-connecting said strapextensions, a hub adjacent each end of each fixed tube, a compressiblemember between each hub and the fixed tube, an extension from each hubconnected to the mentioned rod, a screen disposed above the base andadapted to be reciprocated, means adjustably connecting said hubs tosaid screen, and means to drive said shafts to rotate said cams inunison.

3. A material-screening device according to claim 2: means to adjust theangle of the direction of reciprocation of the screen comprising aflange on said hub, said flange and said hub being rotatable relative tosaid screen.

4. A material-screening device comprising at least two pairs of posts, apair of tubes extending between each pair of posts, a pair of rotatableshafts within said tubes, said shafts being mounted by bearings in saidposts, an eccentric on each end of each of said shafts, a pair of rodsrunning between said posts parallel to said shafts, said rods and saidshafts being inter-connected by a strap encircling said eccentrics, aset of hubs suspended from said rods, said hubs encircling said tubesadjacent the ends thereof, a compressible member disposed between saidhubs and tubes, and a screen suspended from said hub and tubecombination, said screen being adapted to reciprocate upon rotation ofsaid shafts.

5. A material-screening device comprising a base, at least twolongitudinally spaced pairs of posts extending upwardly from the base, ahorizontal screen suspended from said posts and above said base, andmeans to reciprocate said screen along a sloping path that has an angleof slope with respect to the vertical, said means comprising pairs ofeccentrics rotatably mounted on said pairs of posts, a strap engagedaround each eccentric, a pair of rod members extending transverselybetween the straps and angularly offset from the axes of rotation of theeccentrics, said rods being connected to said straps and screen, andcompressible means interposed between the screen and the posts.

6. A material-screening device according to claim 5 in which means isprovided connecting the eccentrics in transverse pairs, and means todrive the eccentrics in unison.

References Cited in the file of this patent UNITED STATES PATENTS1,986,102 Cole Jan. 1, 1935 2,019,661 Dietrich Nov. 5, 1935 2,238,711Soldan Apr. 15, 1941 2,374,663 Carrier May 1, 1945

